This paper documents the design and construction of a voluntary seismic upgrade for a four-story, nonductile concrete flat slab structure. The structure was designed in the early 1970s and lacked detailing necessary to ensure ductile behavior — both in the lightly reinforced concrete columns and in the flat post-tensioned concrete slabs. Since the structure is a modernist landmark and is located in the historic Fisherman’s Wharf area of San Francisco, any strengthening had to have minimal impact on the historic fabric of the structure. After examining a number of possible options, addition of column capitals and fiber-wrapping of the non-ductile columns were selected as the upgrade that best suited the project. The new column capitals use a relatively unusual design that relies on shear-friction between the capital and the column — rather than typical epoxy-dowels — and this method of construction is described in detail. The intent of the upgrade was to satisfy prescriptive requirements as well as desired performance goals.